reconsidering 2 - a850 compare to your older camera

As mentioned in earlier thread, my sd14 was stolen and I reconsider the a850 I was planning to get but keep the sd14 too. No that I no longer have the sd14 I am more careful about my decisions. In this thread I would like to learn from people that migrated from another camera or model to the a850 or a900 (less interested in the a700)

So, if you have moved to a850 or a900 from canon, nikon, sigma pentax or Olympus - what did you gain vs/ what are you missing in your former camera.

While at it, what lenses have you changed to make this move and how worth while had it been?